Join Ben Long for an in-depth discussion in this video Understanding exposure with a reversed lens, part of Lens-Reversal Macro Photography.
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Normally your camera can do a lot of things automatically including focusing and adjusting…shutter speed and aperture.…Shutter speed, ISO, white balance and lots of other things are camera functions.…They happen in the camera, not in the lens.…But focus and aperture are parameters that are controlled within the lens.…Your camera controls these in-lens parameters through these electrical contacts v…on what is normally at the back of the lens.…But because we reversed the lens, the camera has lost contact with the lens.…
So when shooting reversed, you'll have no auto focus, normally you have normal control of aperture.…However, your light meter will still work, so you won't have to guess at exposure.…Now because you've crippled the camera's ability to communicate with its lens, …Auto mode, Program mode and Aperture Priority modes will not work.…Shutter priority may work fine on your camera, but you probably won't have a usable meter in that mode.…So you're going to need to switch to manual.…When working at extremely close macro distances, low light will be a problem.…
In this course, photographer Ben Long details the tools and techniques of lens-reversal macro photography. After investigating reversal ring options, the course explores the focusing and exposure techniques involved when shooting with a reversed lens.